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EMERSON ? ASCO EMERSON – ASCO 302 Solenoid Valve

EMERSON ? ASCO EMERSON – ASCO 302 Solenoid Valve

RS Stock No. 255-6124

Brand EMERSON ? ASCO

  • Manufacturer: EMERSON ? ASCO
  • Section: Pneumatics & Hydraulics
  • Super Section: Pneumatic Valves

€ 77.18

5 in stock now

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EMERSON ? ASCO EMERSON – ASCO 302 Solenoid Valve

EMERSON ? ASCO EMERSON – ASCO 302 Solenoid Valve

RS Stock No. 255-6126

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • Manufacturer: EMERSON ? ASCO
  • Product Type: Mini Solenoid Valve

€ 107.93

2 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 356 12 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 356 12 V Solenoid Valve Coil

RS Stock No. 255-3010

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • For Use With: Solenoid Valves
  • Manufacturer: EMERSON ? ASCO

€ 70.91

5 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 353 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 353 24 V Solenoid Valve Coil

RS Stock No. 255-3013

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • For Use With: Solenoid valve
  • Series: 353

€ 43.67

Temporarily out of stock

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EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

RS Stock No. 257-7225

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • For Use With: Solenoid valve
  • Supply Voltage: 24 V

€ 43.67

149 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108 24 V Solenoid Valve Coil

RS Stock No. 257-7226

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • Manufacturer: EMERSON ? ASCO
  • Super Section: Valves & Taps

€ 43.67

54 in stock now

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EMERSON ? ASCO EMERSON – ASCO 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO 24 V ac Solenoid Valve Coil

RS Stock No. 278-4479

Brand EMERSON ? ASCO

  • Manufacturer: EMERSON ? ASCO
  • Section: Plumbing & Pipeline
  • Super Section: Valves & Taps

€ 40.66

40 in stock now

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EMERSON ? ASCO EMERSON – ASCO 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO 24 V dc Solenoid Valve Coil

RS Stock No. 278-4463

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • Section: Plumbing & Pipeline
  • Super Section: Valves & Taps

€ 40.66

91 in stock now

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EMERSON ? ASCO EMERSON – ASCO 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO 230 V ac Solenoid Valve Coil

RS Stock No. 278-4485

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • Section: Plumbing & Pipeline
  • Super Section: Valves & Taps

€ 40.66

45 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 24 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 24 V Solenoid Valve Coil

RS Stock No. 255-3008

Brand EMERSON ? ASCO

  • Series: 108, 109, 189
  • Super Section: Valves & Taps
  • Supply Voltage: 24 V

€ 43.67

24 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 230 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108, 109, 189 230 V Solenoid Valve Coil

RS Stock No. 255-3009

Brand EMERSON ? ASCO

  • For Use With: Solenoid valve
  • Section: Plumbing & Pipeline
  • Series: 108, 109, 189

€ 43.67

Temporarily out of stock

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EMERSON ? ASCO EMERSON – ASCO Series 189 115/120 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 189 115/120 V Solenoid Valve Coil

RS Stock No. 255-3016

Brand EMERSON ? ASCO

  • For Use With: Solenoid Valves
  • Series: 189
  • Super Section: Valves & Taps

€ 40.66

63 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 108 48 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 108 48 V ac Solenoid Valve Coil

RS Stock No. 257-7224

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • For Use With: Solenoid valve
  • Super Section: Valves & Taps

€ 43.67

10 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

RS Stock No. 656-3197

Brand EMERSON ? ASCO

  • Manufacturer: EMERSON ? ASCO
  • Section: Plumbing & Pipeline
  • Supply Voltage: 230 V ac

€ 48.82

13 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 24 V dc Solenoid Valve Coil

RS Stock No. 656-3210

Brand EMERSON ? ASCO

  • For Use With: Solenoid valve
  • Series: 238
  • Super Section: Valves & Taps

€ 48.82

27 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V dc Solenoid Valve Coil

RS Stock No. 656-3248

Brand EMERSON ? ASCO

  • For Use With: Solenoid valve
  • Manufacturer: EMERSON ? ASCO
  • Section: Plumbing & Pipeline

€ 43.67

Temporarily out of stock

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EMERSON ? ASCO EMERSON – ASCO Series 106/238 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 106/238 230 V ac Solenoid Valve Coil

RS Stock No. 656-3355

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • For Use With: Solenoid valve
  • Manufacturer: EMERSON ? ASCO

€ 43.67

195 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 106/238 24 V ac Solenoid Valve Coil

RS Stock No. 656-3361

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • Category: Solenoid Valve Coils
  • Manufacturer: EMERSON ? ASCO

€ 43.67

61 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 272/374 24 V dc Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 272/374 24 V dc Solenoid Valve Coil

RS Stock No. 656-3383

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • Section: Plumbing & Pipeline
  • Super Section: Valves & Taps

€ 56.48

34 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 552/553 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 552/553 24 V ac Solenoid Valve Coil

RS Stock No. 656-3399

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • Manufacturer: EMERSON ? ASCO
  • Series: 552/553

€ 43.67

Temporarily out of stock

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EMERSON ? ASCO EMERSON – ASCO Series 238 24 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 24 V ac Solenoid Valve Coil

RS Stock No. 656-3456

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • Manufacturer: EMERSON ? ASCO
  • Supply Voltage: 24 V ac

€ 48.82

2 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238 230 V ac Solenoid Valve Coil

RS Stock No. 656-3484

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • Section: Plumbing & Pipeline
  • Supply Voltage: 230 V ac

€ 48.82

16 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 238, 256, 356 48 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 238, 256, 356 48 V Solenoid Valve Coil

RS Stock No. 255-3011

Brand EMERSON ? ASCO

  • Category: Solenoid Valve Coils
  • Section: Plumbing & Pipeline
  • Super Section: Valves & Taps

€ 43.67

11 in stock now

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EMERSON ? ASCO EMERSON – ASCO Series 272/374 230 V Solenoid Valve Coil

EMERSON ? ASCO EMERSON – ASCO Series 272/374 230 V Solenoid Valve Coil

RS Stock No. 656-3226

Brand EMERSON ? ASCO

  • Brand: EMERSON ? ASCO
  • For Use With: Solenoid valve
  • Series: 272/374

€ 56.48

22 in stock now

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...

What is an ASCO valve?
An ASCO valve is a family of solenoid valves and air-operated valves manufactured by ASCO (now part of Emerson). These valves are designed to control the flow of compressed air or liquids in automation and process systems. A typical ASCO valve uses an electric coil to move a plunger or diaphragm, opening or closing a flow path inside a rugged body. They are known for reliability, fast response times, and long service life in industrial environments, making them a common choice for pneumatic control, irrigation, beverage dispensing, and machinery automation.

What types of ASCO valves are available and how do I choose between them?
ASCO offers a range of valve types to suit different control strategies and media. The most common categories are:
  • 2-way valves (single port, on/off control of flow) for straightforward shutoff or isolation tasks.
  • 3-way valves (one inlet and two outlets) for diverting flow or using a pilot-operated arrangement.
  • 4-way valves (two inlets and two outlets) for actuating double-acting cylinders in pneumatic systems.
  • Direct-acting vs Pilot-operated designs, chosen based on system pressure and response requirements.
  • AC coil vs DC coil versions, offering different voltages and power profiles for compatibility with control cabinets and field wiring.
  • Materials and configurations including brass bodies, stainless steel, and plastic/resin bodies, with various seal materials (NBR, EPDM, FKM) for media compatibility.
When selecting, consider media (air, water, chemical compatibility), operating pressure (low to high), temperature, coil voltage, duty cycle, port size (for example 1/8", 1/4", 1/2" NPT or BSP), and environmental protection (IP ratings). RS Components carries a broad range of ASCO valves to cover common industrial needs, ensuring you can pair the valve with the right coil and body material.

How do I choose the right valve for my application (media, pressure, temperature, and wiring)?
Selecting the correct ASCO valve involves matching several key specifications to your system requirements. Consider:
  • Media compatibility: ensure the seal and body material are compatible with air, water, oils, or chemicals in your circuit. Seals may be NBR, EPDM, or FKM depending on the medium.
  • Pressure and flow: verify the valve’s maximum inlet pressure and Cv (flow coefficient) to guarantee adequate performance at your operating point.
  • Temperature: confirm the valve can withstand the ambient and media temperature without degradation of seals or plastic components.
  • Coil voltage and power: choose AC or DC coils in standard volts (e.g., 12 VDC, 24 VDC, 24 VAC, 110 VAC) and review coil resistance and energy consumption for control panel sizing.
  • Port size and thread: select the correct port threads (NPT, BSP, metric) and size (1/8", 1/4", 1/2" are common) to fit your plumbing.
  • Environment and IP rating: rugged industrial environments may require IP65/67 ratings and robust housings.
If in doubt, start with a general-purpose 2-way or 3-way valve in a standard coil voltage, then determine if a pilot-operated variant offers reduced energy use or improved performance at your operating pressure.

What are common ASCO valve configurations and how do I wire them?
Common configurations and wiring notes include:
  • 2-way normally closed (NC) or normally open (NO) variants, used for simple on/off control of a line.
  • 3-way valves for diverting flow or implementing a bleed path in pneumatic circuits.
  • 4-way valves for controlling double-acting cylinders in actuator applications.
  • Wiring: DC coils are typically wired with a DC supply and may require a diode or suppression device; AC coils may need a transformer and appropriate harnessing. Always follow the manufacturer wiring diagram and ensure proper polarity for DC coils when applicable.
Typical installation involves securing the valve to a panel or manifold, connecting the inlet/outlet ports to the correct lines, and wiring the coil to a control relay or PLC output. For reliability, keep wiring tidy, avoid excessive voltage inrush, and protect coils from moisture and dust with gaskets or housings where required.

What are typical applications for ASCO valves?
ASCO valves are used across many sectors to precisely control flow and pressure. Typical applications include:
  • Pneumatic system control in packaging, automation, and material handling
  • HVAC and climate control for zone isolation and actuator functions
  • Water treatment, irrigation, and beverage equipment where clean, reliable shutoff is required
  • Medical devices and laboratory instrumentation requiring rapid, repeatable valve operation
  • Industrial machinery, robotics, and OEM equipment for precise actuation
When integrating with RS Components’ catalog, you’ll find ASCO valves offered in configurations optimized for quick integration into standard assemblies, with documentation and compatibility information for easy procurement and replacement.

How do I maintain ASCO valves and troubleshoot common issues?
Routine maintenance helps maximize life and reliability. Common checks include:
  • Inspect power supply and confirm the coil is energizing correctly; a buzzing or no-click may indicate coil or wiring issues.
  • Check for leaks at seals, body joints, and port connections; replace seals if worn or degraded.
  • Ensure clean media and proper filtration to prevent fouling of internal components.
  • Test the valve’s response time and verify that pilot-operated variants operate as expected under system pressure.
  • For DC coils, measure resistance to detect winding faults; for AC coils, verify correct voltage and absence of overheating.
If corrosion or heavy fouling is present, disassembly and thorough cleaning or coil replacement may be required. Always follow safety procedures when servicing valves on live systems.

Why purchase ASCO valves from RS Components?
RS Components offers genuine ASCO valves with broad coverage of sizes, materials, and coil options to fit many automation designs. Benefits include:
  • Extensive product range with datasheets, technical support, and compatibility notes
  • Access to official ASCO parts and cross-references for quick replacements
  • Fast shipping, global availability, and clear pricing for project planning
  • Documentation for safety, installation, and maintenance to help ensure compliance
Whether you need a 2-way brass-bodied valve with 24 VDC coil or a stainless steel 4-way valve with 110 VAC coil, RS Components can help you find the right ASCO valve for your application and integrate it into your control system efficiently.

What should I consider for compatibility with existing systems and accessories?
Consider accessory compatibility to optimize performance and ease of maintenance:
  • Manifolds and brackets for rapid installation and modular control
  • Connectors and wiring harnesses to match coil voltage and color coding
  • Filters and regulators to protect valves from contaminants and regulate supply pressure
  • Seal kits and replacement parts for long-term serviceability
  • Thread adapters (NPT, BSP, metric) to fit existing piping
Confirm the thermal and electrical ratings align with your control cabinet, and select valves with documentation that matches your safety and maintenance standards.

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